在NCTUns平台上模擬IEEE 802.16j Transparent mode WiMAX網路

WiMAX is a new broadband wireless access technology, which is designed to provide a last-mile solution for metropolitan area networks. The IEEE 802.16j (MMR WiMAX) draft standard is currently under development and based on the IEEE 802.16e (Mobile WiMAX) standard. It not only provides multi-hop relay capability but also extends base station coverage by deploying relay stations around base stations. In addition, by deploying cost-effective relay stations, the IEEE 802.16j can reduce the number of base stations that should be deployed in the network, which greatly reduces the deployment cost of a network. In this thesis, we developed the IEEE 802.16j centralized scheduling transparent WiMAX network protocol modules on the NCTUns network simulator. We implemented three new types of nodes, MR-BS (Multi-hop Relay Base Station), FRS (Fixed Relay Station) and MS (Mobile Station). The developed MAC-layer modules support a simple subscriber path selection algorithm and an adaptive modulation scheme to boost network performance. At the physical layer, we use the OFDMA TDD mode collocating frame structure in transparent-mode WiMAX network. Our work provides a convenient simulation platform for researchers that are interested in IEEE 802.16j transparent mode WiMAX networks.